Other receivables and other assets - Narrative (Details) - EUR (€) € in Thousands |
12 Months Ended | 145 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2025 |
Dec. 31, 2023 |
|
| Disclosure Of Other Receivables And Other Assets [Line Items] | ||||
| Proceeds from research tax credit | € 5,640 | € 4,493 | € 41,200 | |
| Research tax credit ("CIR") | 3,196 | 5,774 | 3,196 | € 4,600 |
| Current prepaid expenses related to CRO | 1,068 | 1,577 | 1,068 | 1,347 |
| Current advances to suppliers | € 2,207 | 2,604 | € 2,207 | 3,567 |
| Kreos & Claret financing, tranche B | ||||
| Disclosure Of Other Receivables And Other Assets [Line Items] | ||||
| Reclassification of prepaid expenses to carrying value of debt component | € 1,546 | |||
| Deferred financing costs | ||||
| Disclosure Of Other Receivables And Other Assets [Line Items] | ||||
| Borrowings | € 3,152 | |||